Christopher ________ charity work by raising a lot of money to promote medical research.
We should try our best to ______ those people after the disaster.
_________ he stayed in Germany for half a year and he will go to Germany _________again.
—Catherine, I have cleaned the room for you. —Thanks. You_______ it. I could manage it myself.
—What makes Tom unpopular with his fellows? —__________.
If you cheat in the exam, you could hardly _______it.